n,m=map(int,input().split())
M=10**9+7
v=list(map(int,input().split()))
r=list(map(int,input().split()))
V=sum(v)
R=sum(r)
qv=[0]*(V+1)
qv[0]=1
for c in v:
  for i in reversed(range(V+1)):
    if i-c>=0:
      qv[i]+=qv[i-c]
      qv[i]%=M
qr=[0]*(R+1)
qr[0]=1
for c in r:
  for i in reversed(range(R+1)):
    if i-c>=0:
      qr[i]+=qr[i-c]
      qr[i]%=M
a,b=map(int,input().split())
g=0
for i in range(1,V+1):
  qv[i]+=qv[i-1]
  qv[i]%=M
for i in range(1,R+1):
  if a*i<=V:
    g+=(qv[min(b*i,V)]-qv[a*i-1])*qr[i]
    g%=M
print(g)